February 2023

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comments by ‘zhihua’

对于ASR9000来说 :
“show interfaces” and “show policy-map interfaces” show L2 frame size.
“show interfaces” does not include FCS bytes, but “show policy-map interfaces” includes FCS bytes(SIP700是个例外)

L1 frame size 和 L2 frame size


  • Preamble: 前同步码 7 bytes
  • SFD: start frame delimiter 1 byte 帧开始定界符
  • Dst MAC: 6 bytes
  • Src MAC: 6 bytes
  • EtherType: 2 bytes
  • FCS(CRC): 4 bytes
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